This video shows how to make a bottle rocket using hair spray and a plastic Propel bottle (or a bottle with a small hole in the cap). First, unscrew the cap on the plastic bottle. Then take the cap from the hairspray, and spray directly into the cap for about ten seconds. You then pour the hairspray from the cap and into the bottle. After replacing the plastic bottle's cap, hold the bottle slightly downward so the hairspray goes towards the cap, and spray a little bit on the outside of the cap as well. Then carefully place the bottle on the floor, onto its side, after squeezing and rotating the bottle a few times. Then light, and the bottle goes flying away on its own!